Aerocartograph



AEROCARTOGRAPH V Filed April 12, 1929 Y Patentes ret. v4, 193e ,UNrrgED .STATteA NATIONALE PATENTVERWERTUNGS A.e., onrvaDUzY 11u FUJ'asTEN'rUM, I'JIECHTEN.'

STEIN 'I AEROCARTGRA'PH applicati@ mea Apen V12, 192e, seriai'No. 354,914,511@ in Germany sestember 7, 192s.

As in well known,y in kaerocartographs, that.' 1s to say instruments for plotting stereophotogrammetric pictures,y the motion of space-guides is transmitted to `the measuring device, that is tosay to the fpicture carriers e 1 on the one hand and to the inlet' reflectors v'on the other'hand, by an intermediate body being interposed between the guide andthe moving member of the measuring device, such that it can be displaced along'an axis and is VYprovided with extensions, the points of application of which on the guide on the one hand and onV the moving member on the other hand are equidistant from the said axis, one extension beingin the form of a circular ring or asection of a circular ring at right angles to the said axis.

' In an arrangement of this kind there will be frictio'nboth at the spindle embodying the sliding axis, alongv which there is sliding motion,v and at the circular ring, on the amount of which depends the accuracy of the directional transmission. In this known arrangement, for reducing the frictionit is not possible simply to use ball bearings, such as are ordinarily used for such a purpose, as both at the sliding spindle and at the circular ring two motions take place Vat right angles to one another, namely a rotary and a sliding motion.

This disadvantage asregards the accuracy e inthe directional transmission is overcome in accordance withthe present invention, by

Lthe intermediatebody being divided into two parts which are capableof rotating with respect to one another, each one of which carriesone of the extensions referred to above. The circular ringv ory sectionl of a circular ring is however so constructed ythat it is carried round by the space-guide which rotates ,y lthe sliding spindle, so that this partzof the `does not perform a sliding motion relative toy the first part, b ut only a rotary motion,

Consequently it is possi-ble to provide two vball bearings, such that one'of them has only f InY the accompanying V'drawing a construc- *m-ENIT fFFC i i.

- REINHARD HUGERsvI-I'OFF, or DRESDEN, GERMANY, assreivonmo ixniws INTR- sliding motion and the other only a rotary f On theV cylindrical spindle Z embodying the i axis there slides the intermediate bodyv consisting of the parts K1 and-K2 and having i the points of application A1 and'A2 for the guide H1 and the movable H2 of thepicture carrier P. Y Both points of application are equidistant from the sliding axis S-S. The cylindrical spindle Z is mounted so as to be rotatable in the socket B fixed to thebase and at the top supports the-picture carrier P. The guide H1 isconnected by the horizontal pivot Q to the cylindrical spindle Z. Each horizontal rotary motion of the guide H1 is transmitted to the spindle Z and consequently to the picture carrier P. The lower part K1 of the intermediate body takes part inthe same rotary motion, so that it performsrno rotary motion whatever relative to the spindie Z, but rotates relatively to the upper part K2 which is heldin position by the guide F. The friction due to the relative rotary motion of the parts K1 and K2 is reduced by the ball bearingL2. lIn this tilting motion Vof the guide H1 the parts K1 and K2 of the intermediate body slide along the spindle Z in such a manner that the moving member l H2 tilts through the same angle as the guide H1- Thefriction due to the purely sliding motion between the part K1l and the spindle Z is reduced by the ball bearing L1.

What I claim is:

1. An instrument for plotting measuring photographs, l. comprising a lever (H2), Va space-guide (H1), a spindle capable of being rotated by the space-guide, an intermediate body between the lever (H2) and the spaceguide (H1) mounted on the said spindle'in sucha manner as to be capable of sliding thereon, the said bodyr comprising two parts (K1, K2) capable of rotating relative to one another, of which the .part (K2) is co-operatively associated .with the lever (H2) 'and (H1) andtmeans' (F) .which prevent the Athe other party (K1) with the' space-guide rotation of the part (K2) relative to the spindle, as' and for the purpose set forth.

2. An instrumentrfor plotting measuring photographs, comprising a lever (H2), a space-guide (H1), a spindle capable of being' rotated bythe spaoe-guide, an intermediate body between the lever (H2) and the spaceguide (H2) mounted on the said spindle in` such a manner as tobe capable of sliding thereon, the said body comprising two parts (K1, K2) capable of rotating relative to one another, of which the part (K2) is oo-operatively associated with the lever (H2) and the other part (K1) with `the space-guide (H1), means (F) which prevent the rotation of the part (K2) relative to the spindle, ball bearings (L1) between the part (K2) and the spindle and ball bearings (L2) between the part (K1) and the part (K2), as and for the purpose set forth. l Y

In testimony whereof I have signed my name to this specification. l

- REINHARD HUGERSI-IOFF. 

